000 AXNT20 KNHC 262336 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 735 PM EDT Wed Jul 26 2017 Tropical Weather Discussion for North America, Central America Gulf of Mexico, Caribbean Sea, northern sections of South America, and Atlantic Ocean to the African coast from the Equator to 32N. The following information is based on satellite imagery, weather observations, radar and meteorological analysis. Based on 1800 UTC surface analysis and satellite imagery through 2315 UTC. ...TROPICAL WAVES... A tropical wave is off the W coast of Africa extending from 16N27W to 06N27W, moving W at 15 kt. The wave has a distinct moist area as seen on SSMI TPW imagery. The wave location is in conjunction with a 700 mb trough. The wave is in a region of favorable to neutral vertical wind shear. It has,however,Saharan dry air and dust N and W of the wave environment. Scattered showers are within 180 nm of the wave axis. A tropical wave is in the E Atlc with axis extending from 12N37W to 03N37W, moving W at 10 kt. This wave has a low amplitude surface reflection with moisture confined mostly along the monsoon trough S of 12N. There is a 700 mb trough S of 12N. The wave is in a region of favorable vertical wind shear, however, it continues to be severely affected by Saharan dry air dust N of 12N. Scattered moderate convection is E of the wave axis from 8N-10N between 34W-37W. Scattered showers are within 180 nm of the remainder of the wave axis. A tropical wave is in the central Atlc with axis extending from 23N55W to 12N55W, moving W at 15 kt. The wave has a distinct moist area as seen on SSMI TPW imagery. The wave location is in conjunction with a large high amplitude 700 mb trough. The wave is in a region of unfavorable vertical wind shear. Scattered moderate convection is over the southern portion of the wave from 10N-13N between 52W-57W. Scattered moderate convection is over the northern portion of the wave from 22N-26N between 54W-58W. A tropical wave is in E Caribbean with axis extending from 18N67W to 07N66W, moving W at 15 kt. This wave has a low amplitude surface reflection. The wave has a distinct moist area as seen on SSMI TPW imagery S of 14N. The wave is under a large 700 mb trough. The wave is in a region of unfavorable to neutral vertical wind shear. Scattered showers are within 180 nm of the wave axis. ...ITCZ/MONSOON TROUGH... The monsoon trough extends from 13N17W to 11N30W to 07N43W . The ITCZ begins near 07N43W and continues to 09N61W. Besides the convection mentioned in the tropical wave section, scattered moderate convection is along the monsoon trough from 08N-10N between 30W-34W. ...DISCUSSION... GULF OF MEXICO... A 1020 mb high is centered over the north central Gulf of Mexico near 28N91W. 5-10 anticyclonic winds are noted around the high. A surface trough is over the W Gulf of Mexico from 24N97W to 19N95W. Scattered moderate to isolated strong convection is within 180 nm of the trough axis. Elsewhere, clusters of widely scattered moderate convection are over, the Florida Peninsula, the Straits of Florida, W Cuba, the SE Gulf, and the N Yucatan Peninsula. In the upper levels, an upper level low is centered over the NW Gulf near 27N95W. Upper level moisture covers most of the Gulf. Expect little change over the next 24 hours. CARIBBEAN SEA... A tropical wave is over the E Caribbean. See above. Elsewhere, the extension of the Pacific monsoon trough is producing scattered moderate to isolated strong convection over Costa Rica, Panama, and the SW Caribbean S of 14N. 15-25 kt tradewinds are over most of the Caribbean Sea with strongest winds over the central Caribbean. In the upper levels, an upper level low is centered over the SW Caribbean near 12N81W. Expect more convection over the southern Caribbean over the next 24 hours. ...HISPANIOLA... Scattered moderate convection is presently over Hispaniola. Expect more convection to advect over the island over the next 24 hours due to the northern extent of a tropical wave. ATLANTIC OCEAN... Scattered showers are over the N Bahamas and the W Atlantic, N of 24N and W of 77W. A 1025 mb high is centered over the central Atlantic near 31N45W. The high is producing fair weather. Surface ridging is along 31N. In the tropics, there are three tropical waves. See above. Of note in the upper levels, a large upper level low is centered over the W Atlantic near 28N57W. Scattered showers are within 360 nm of the center. No major changes expected through next couple of days. For additional information please visit http://www.hurricanes.gov/marine $$ Formosa